Volume 575, March 2015
|Number of page(s)||9|
|Published online||19 February 2015|
Perturbations of gyrosynchrotron emission polarization from solar flares by sausage modes: forward modeling
CmPA, Department of Mathematics,
2 Radiophysical Research Institute (NIRFI), 603950 Nizhny Novgorod, Russia
3 Institute of Solar-Terrestrial Physics, 664033 Irkutsk, Russia
Received: 7 July 2014
Accepted: 16 December 2014
We examined the polarization of the microwave flaring emission and its modulation by the fast sausage standing wave using a linear 3D magnetohydrodynamic model of a plasma cylinder. We analyzed the effects of the line-of-sight angle on the perturbations of the gyrosynchrotron intensity for two models: a base model with strong Razin suppression and a low-density model in which the Razin effect was negligible. The circular polarization (Stokes V) oscillation is in phase with the intensity oscillation, and the polarization degree (Stokes V/I) oscillates in phase with the magnetic field at the examined frequencies in both models. The two quantities experience a periodical reversal of their signs with a period equal to half of the sausage wave period when seen at a 90° viewing angle, in this case, their modulation depth reaches 100%.
Key words: Sun: oscillations / Sun: radio radiation / Sun: flares / magnetohydrodynamics (MHD)
© ESO, 2015
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